51146388 has 72 divisors (see below), whose sum is σ = 136002048. Its totient is φ = 16175808.

The previous prime is 51146369. The next prime is 51146413. The reversal of 51146388 is 88364115.

51146388 is a `hidden beast` number, since 5 + 1 + 14 + 638 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184506 + ... + 184782.

Almost surely, 2^51146388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51146388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68001024).

51146388 is an abundant number, since it is smaller than the sum of its proper divisors (84855660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51146388 is a wasteful number, since it uses less digits than its factorization.

51146388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 528 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 51146388 is about 7151.6702944137. The cubic root of 51146388 is about 371.1974547270.

The spelling of 51146388 in words is "fifty-one million, one hundred forty-six thousand, three hundred eighty-eight".